Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5198
標題: 電蝕鋁箔廢液回收再利用之可行性研究
A Feasibility Study on Reclamation of Waste Liquid from Etched Aluminum Foil
作者: 李明美
Li, Ming-Mei
關鍵字: 電解鋁箔;electrolytic aluminum foil;硫酸置換法;硫酸鋁;鹽酸;硫酸;sulfuric acid addition;aluminum sulfate;hydrochloric acid;sulfuric acid
出版社: 環境工程學系所
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摘要: 
電解鋁箔在蝕刻及化成處理製造過程中會產生大量的廢酸液,可分為電蝕鋁箔廢液及化成鋁箔廢液兩類,而統稱為電解鋁箔廢液。由於其含有高濃度的鹽酸、硫酸根離子及鋁離子,具有回收再利用價值,且依環保署公告之「有害事業廢棄物認定標準」規定,此廢液屬於有害事業廢棄物中的腐蝕性事業廢棄物。惟目前業者仍利用稀釋或鹼中和方式處理,且隨著生產線的擴充,廢液產量也日漸增加,造成廢水處理成本之沉重負擔,已成為業者急需解決的問題。本研究之主要目的即為協助解決鋁質電解電容器上游產業所遭遇的廢液處理問題。
首先針對電解鋁箔產業現況、電蝕鋁箔廢液產出、清理及再利用現況等進行廢液產出背景資料分析,進一步評析國內外相關再生利用技術,再利用實驗完成電蝕鋁箔廢液資源化研究,評析以硫酸置換法回收電蝕鋁箔廢液之可行性。本研究乃採集國內電解鋁箔製造廠產出之電蝕鋁箔廢液(含氯化鋁之廢混酸)作為研究對象,於實驗室中利用硫酸置換法進行回收再利用之可行性研究,以不同之反應莫耳比、操作溫度、時間、壓力及濃度等操作參數進行批次實驗,建立回收再利用之最佳反應條件。同時為瞭解資源化產品之可能應用途徑,進行資源化產品之組成與物化特性分析,針對其特性探討資源化產品市場之運作。
電蝕鋁箔廢液以真空蒸餾濃縮設備進行硫酸置換法之再生利用試驗結果顯示,可同時兼顧廢鹽酸及硫酸混酸的回收,鹽酸回收率可達97.43%以上,硫酸鋁析出量可達35.41公克以上。若考量資源回收效率、加工操作之難易度、能源損耗、設備材質需求、反應後漿料流動性及硫酸鋁析出量等要素,以H2SO4/AlCl3反應莫耳比4.0、操作時間60分鐘、操作壓力60 mmH2O及操作溫度85℃為最佳,氯化鋁濃度則愈高愈好。而所得之資源化產品固態硫酸鋁,在經過充分淋洗後可符合國家標準CNS 2072 工業用硫酸鋁之2號2及3級硫酸鋁規範,氧化鋁濃度介於15.3~16.7%之間、三氧化二鐵低於偵測極限值,不溶物為0.02~0.03%,其應用途徑與一般市售硫酸鋁無異。鹽酸之回收濃度約21~27%左右,比重介於1.105~1.135之間,總鉛、總銅、總汞及總砷等重金屬含量多低於偵測極限值。

A large quantity of waste acid liquid is generated during the etching and forming processes of electrolytic aluminum foil. The waste liquid can be divided into two types of waste liquids from etched aluminum foil and formed aluminum foil. They are termed as spent acid in the process of electrolytic aluminum foil in general. As hydrochloric acid, sulfuric acid and aluminum ions of high concentration are contained, reclamation is valuable. According to the regulation in the Standards for Defining Hazardous Wastes of Enterprises announced by the Environmental Protection Administration, this type of waste liquid is categorized as a corrosive industrial waste. However, enterprises still adopt dilution or alkaline neutralization for treatment currently. The output of waste liquids increases with an expansion of production lines causing a heavy cost of waste water treatment, which has also become an urgent problem for the enterprises. The major purpose of this study is to assist the upstream industry of aluminum electrolytic capacitor manufacturers in solving the problem of waste liquid treatment they confront.
First, information on the status quo of the electrolytic aluminum foil industry and the throughput, cleaning and recycling of waste liquid from etched aluminum foil have to be analyzed. Domestic and overseas reclamation technologies have to be further evaluated. And then, a study on recycling waste liquid from etched aluminum foil have to be completed by experiment for analysis of the feasibility of recycling the waste liquid from etched aluminum foil with sulfuric acid addition. The object of study is the waste liquid (mixed acid including aluminum chloride) from etched aluminum foil produced by domestic etched aluminum foil manufacturers. A feasibility study on reclamation is conducted in the laboratory with sulfuric acid addition. Batch experiments are made by different operation parameters like molar ratio, operating temperature, time, pressure and concentration for establishment of the optimum reaction conditions for recycling. Meanwhile, compositions, physical and chemical analyses of recycled products are conducted for an understanding of potential applications of recycled products. Furthermore, market operation for recycled products is also explored in accordance with their characteristics.
The experimental results of recycling waste liquid from etched aluminum foil with the vacuum distillation and condensation equipment by applying sulfuric acid addition show recycling of waste mixed hydrochloric and sulfuric acid can be made at the same time with a hydrochloric acid recovery ratio of over 97.43% and a precipitation amount of aluminum sulfate more than 35.41 grams. If elements of recycling efficiency, processing difficulty, energy consumption, rheology property of slurry and precipitation amount of aluminum sulfate are considered, the molal ratio of H2SO4/AlCl3 of 4.0 for 60 minutes at an operating pressure of 60 mmH2O and an operating temperature of 85℃ is the optimum. The higher the concentration of aluminum chloride, the better. Solid aluminum sulfate, the recycled product, meets CNS 2072, the specifications for levels 2 and 3 aluminum sulfate after adequate flushing, which are a concentration of aluminum oxide between 15.3~16.7%, an ND value for Fe2O3 (ferric oxide) and 0.02~0.03% of insoluble substance. The application is the same as that of aluminum sulfate on the market. The recovery concentration of hydrochloric acid is around 21 to 27% and the specific weight ranges between 1.105 and 1.135. Heavy metal contents of lead, copper, mercury and arsenic are non-detectable mostly.
URI: http://hdl.handle.net/11455/5198
其他識別: U0005-2208200613525100
Appears in Collections:環境工程學系所

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